Aquarium Powerhead Filter Tube

This is my second time creating a 3D object so I apologize if it doesn't slice/print as well as it did for me.

This should snugly fit the end of some common aquarium powerhead inlets. It needs to be scaled by 25.4 as I accidently used inches.

I included the gcode in case it helps someone (properly scaled).

Please comment on how I might be able to improve the design!